XML 74 R63.htm IDEA: XBRL DOCUMENT v3.8.0.1

Residential Mortgage Loans Held in Securitization Trusts (Net) and Real Estate Owned - Schedule of Geographic Concentrations of Credit Risk (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
New York
Concentration Risk [Line Items]
Geographic concentration, percent	21.60%	0.00%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | New York
Concentration Risk [Line Items]
Geographic concentration, percent	32.00%	33.80%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Massachusetts
Concentration Risk [Line Items]
Geographic concentration, percent	19.90%	19.90%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	11.10%	10.80%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.00%	8.90%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Connecticut
Concentration Risk [Line Items]
Geographic concentration, percent	8.10%	7.40%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	5.30%	5.10%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_NY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=nymt_ResidentialMortgageLoansHeldInSecuritizationTrustsAndRealEstateOwnedHeldInResidentialSecuritizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_MA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_NJ
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_FL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_CT
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_MD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: